Metal-heating device.



H. GEISEIIHUNER. METAL HEATING DEVICE. APPLICATION FILED AUG. I3. I918.

Patented Apr. 8,1919.

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H. GEISENHUNER. METAL HEATING DEVICE.

. APPLICATION FILED AUG. 13, I918- 1299,931 Patented Apr. 8,1919,

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Inventor Henry Geisenhner:

ILbbJ UNITED snares Parana HENRY GEEENHfiNEB, 0F SGHENECTADY, NEW "$03K, ASSIGTNQR T0 @ENEEtdJL ELECTRIC COMPANY, A CORPORATION OF NEW YOELK.

METAL-HEATING DEVICE.

' Fatentcd Apr. c, 319519.

I Application filed. August 18, 1918. Serial No. 2 29,7142.

TQ'aZZ whom it may concern Be it known that l, HENRY Gnisnnnonnn, a citizen of the United States, residing at Schenectady, in the county of Schenectady,

5 State of New York, have invented certain new and useful Improvements in Metal- Heating Devices, of which the following is a I specification. i

The present invention comprises a new methodand apparatus for heating elongated objects, such, for example, as bclt'blanks. It is the object of my invention to enable such objects to be heated uniformly and to a desired temperature either as a whole or over a desired length.

It has been suggested to heat rivets by passage of current from a terminal making a butt connection with the head of a rivet to another terminal makin contact with the rivet shank but this method of heating results in the rivet head immediately adjacent the butt contact being heated to redness and even melted while the shank is still below red heat. A butt contact has so much higher 25 resistance than a clamped lateral contact that most of the heat is generated at the butt contact with consequent local overheating.

In accordance with my invention elongated objects are heated by first passing current between contact clamps engaging laterally with the object and then passing current be tween a butt contact and a lateral contact. My invention includes also an'apparatus for carrying out this process.

In-the accompanying drawing Figure 1 is a side elevation ,of an apparatius embodying my invention; Fig. 2 is a top view; Fig. 3 is an end view of one set of clamping contacts, and Fig. 4 is an end view of a section through lines l'-l of Fig. 2, showing a set of contact clamps cobperating with the clamps shown in Fig. 3.

The apparatus shown in Fig. 1 comprises a transformer consisting of a core 1, a. primary winding 2, and a secondary windin 3 consisting usually of a single turn. T is heating transformer is mounted on a base 4 and carries a framework 5 on which are mounted the various clampin devices for holding'the work and conveying a heating current thereto. I

The apparatus is provided with duplicate sets of contact clamps, so that two blanks may be heated alternately, one beingreplaced after having been brought to temthe blanks being adjacent the butt contacts 12 and 13. All of these contacts are operable by a singlehandle is pivoted at 15, as will be described later. As shown in. Fig. 3

the movable jaw 16 01 the clamp 9 is mounted on a lever 17 rocking on a pivot 18 and connected by means of a flexible conductor 19 to a plate 20. The movable jaw 16 cooperates with a stationary jaw 21. A spring 22 holds the jaws 16 and 21 apart, unless they are forced toward each other by the cam 28 ridin upon. a roller bearing 2 attached to the aw 16. Removable linings for these clamps to receive the wear are provided. The clamp '8 shown in an open posi tion has the same construction.

As shown in Fig. l the clamps 10 and 11 each consist of two mo vable lever jaws 25, 26,

pivoted respectively on pins 27, 28, near their centers; As best shown in Fig. 2, the links 29, 30 connect the lever jaws 25, 26, their upper ends to a hinge block Ell, which is in turn connected to a rod 3-2 liding through a guide 33 fastened to the movable terminal plate 13 (Fig. 1). In. Fig. 2 the rod 32 connected to the lower clamp has been shown in part broken away. This rod is connected to reciprocating mechanism, as will through a slot in the lever 41. The lever 41 is movably pivoted at one extremity by a pin 43 to a bracket 44 which is attached to a plate 45 constituting a transformer terminal. The lever i1 is movably pivoted at the opposite extremity to a rod 4:6, which is in turn connected to the handle 14. The block 40 is connected through rack and clouble segment lever 47 to the c rreswncling block upon the opposite slue oi the device which is mounted upon a corresponding Tool connected to the bracket As the reel been shown broken away in Fig. 2, lbs construction may be better understood by reference to the connection oi? the corre spending rod 3 .I' to the block heatecl. This plug as may be easily replacerl w tire mechanism.

lo. the position 3' cf the handle M. (Fig 1') size lateral contacts 9 and 11, and the butt contact 13, are closed and the opposite contacts 8, 10 and 12 are open. The sequence of operations may be better uuclerstoocl'b considering the handle 14% iii. position H. All the contacts are then open. A blank may then be inserted in contacts 9, 11 and 13, ancl another removed on the opposite side. The handle is then moved into position I closing contacts 9 and; ll, and moving. the butt contact 13 against the end of the blank by compressing the sprin 38. The handle is thenmoved back to position H. The contact 9 remains closed but the contactj'aws 11 open up. The contact 13 remains pressed against the end of the rod 6 by the spring 38, the tension of which is not entirely released.

At the beginning oflthe described operation, rllerefore, the blank 6 is given a preliminary beating between contacts 9 and 11, The contact; clamps 13. are connected to the plate 13 which in turn is connected to one terminal oft-lie transformer secondary 3 by The flexible leads 50, the coat-act 13 and the flexible lead. 51. When the ham-ills 142 is moved back to position 2 anal the contacts 11 are drawn away from the blank 6, which 3 v be assumed to be at a clull red beat, curpasses between the butt contact 13 and she lateral clamping contact 9, completing beating of the blank by bringing the end zljaccnt she buck com-act up to temperature (l raising thispar' of the blank as Well as remaining section beyween the contacts a so the required temper re. The handle on moved back to posi .011 Ill. Anofiber inserted into contacts 8, 10- anil handle 14 moved to position V. lira position the contacts 8, l0 anil 12 are *2 while 'ibc contacts 9, ll and 13 remain The blank is then removed. cycle above described is then repeated reference to the blank '3, current first en worn by use without disturbing the enpassing between the clampingcontacts 8 and the contacts 10, as well as the butt contact 12, to give the blank a preliminary heating, and the handle then being moved back to position IV to open the lateral,clampingcontacts 10 and to complete the heating by;

a current passing between the contacts 8 and' contacts "10 and 11 through the hollow sup-- porting pins 27 and 28and 27' and 28, and

final y flows over the exterior of the contact jaws 25, 26, into a pan 53 from whichit is cliscbai ged through ogening 54. The contact clamps 8 and 9- are cooled by afiuid suppliezl 'tln'ough tubes 55 and 56 water flowing through the ducts, indicated by dotted lines in Fig, 3 and flowing over the exterior of the contact jaws into the pan 53.

The length of the section of the blank which is being heated. may bevaried by moving the contacts 8 and 9 toward an from the contacts 10 and 11. The lower ends of these contacts are attached to clam ing bolls 57 sliding back and forth within slots 58 in the framework 5, andada ted to be fastened in any desired position y the nuts 59 shown in dotted. lines, in Fig. 1.

Wluit' I claim as new and desire to secure by Letters Patentof the United States, is 1-3 1.. The method of. heating all elongated body which consists in passing a prem l limiaary beating current between a lateral contact near/an end of said body and a more remote contact and thereupon continuing the current iziipllt a}, said end from a butt contact. .i

2, The vimzthocl of heating an clongateil metal burly which consists in first heating said body between a region of current input at and about an end of said body and a more away remote contact, thereupon iucreasing the current density at said end by restricting the contact area to a butt connection, as? continuing the heating by passage of cur rent from said butt contact until a desired temperature has been attained.

3. A metal heating device comprising the combination of a contact clamps, means for causing sai clamps to engage with work to be heated, a third cooperating contact and means for holding said third contact into an agment with the work and simultaneous y disengaging from the work one of the paired contacts;

. 4. A metal heating con tact clamps, a lever having a, cam surface engagmg with one of said clamps, links pair of workengagin 4 I (lance comprising the combination of a pair of work-engaging connecting another of said contacts with said lever, a third cooperating contact, and means for holding said third contact into engagement with Work held by one of said pair of contacts while the other is disengaged from the work.

5. An apparatus iior heatingan elongate conductive object which consists in the combination of a heating circuit, two contact clamps connected to said circuit for laterally engaging an object to be heated, a contact also connected to said circuit for making a butt connection with said object, means for causing said lateral contact clamps to grasp an object to be heated and convey a Heating current therethrough, means for retracting one of said clamps nearer the butt contact, means for exerting pressure between said object and said butt contact while the adjacent lateral contact is retracted.

6. A metal heating device comprising the combination of work-engaging contacts adapted to laterally engage work to be heated, a butt contact connected in common with one of said lateral contacts, a lever having a cam surface engaging with one of said contacts to operate the same, links connecting another of said lateral contacts with said lever and movable thereby into engagement with the work, and means for exerting pressure upon the work by said butt contact by said lever while disengaging the work from said second lateral contact.

In witness whereof, I have hereunto set my hand this 12th day of Aug., 1918.

HEN RY GEISENH6NER. 

